CN109023092B - 1300 MPa-grade hot forming steel for wheel rim and preparation method thereof - Google Patents
1300 MPa-grade hot forming steel for wheel rim and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/009—Pearlite
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Abstract
The invention discloses 1300 MPa-grade hot forming steel for a rim and a preparation method thereof, wherein the steel comprises the following chemical components in percentage by weight: 0.19-0.24% of C, 0.10-0.30% of Si, 1.00-1.40% of Mn, less than or equal to 0.010% of P, less than or equal to 0.004% of S, 0.020-0.040% of Ti, 0.0030-0.0040% of B, and the balance of Fe and inevitable impurities. The hot rolling and cover annealing treatment process is adopted, the strength of the steel plate can be reduced, the elongation is improved, and therefore the steel has good forming performance and welding performance, the tensile strength of the hot rolled steel plate is less than or equal to 520MPa, the yield strength is less than or equal to 400MPa, the elongation is more than or equal to 30%, after the hot formed steel is treated by the conventional hot forming process, the tensile strength is more than or equal to 1300MPa, the yield strength is more than or equal to 1000MPa, and the elongation is more than or equal to 10%.
Description
Technical Field
The invention relates to the technical field of hot-rolled automobile steel, in particular to 1300 MPa-grade hot-formed steel for a rim and a preparation method thereof.
Background
The automobile industry of the 21 st century can reduce fuel consumption and CO2And exhaust emissions have become a social need, the steel industry as a material manufacturing plant has developed many types of ultra-high strength steel sheets to help reduce steam in response to this trendThe vehicle weight is suitable for new requirements of the automobile industry.
The processing of the ultrahigh-strength steel plate by using the traditional cold stamping process has a plurality of technical obstacles such as stamping part springback, die loss and the like; meanwhile, the performance of the material is greatly required, so that the material is high in price, and the large-scale application of automobile manufacturers is hindered. In order to solve the problem, the hot stamping technology of the super-strength steel plate is produced at the same time. The technology heats an advanced high-strength steel plate to austenite temperature and then rapidly performs stamping forming, and realizes quenching through a die and reaches the required cooling speed in the pressure maintaining stage, so that the ultrahigh-strength part with uniform martensite and the strength of about 1500MPa is obtained. By using the technology, the material does not have high strength before processing, so that the problems existing in the traditional cold processing can be effectively avoided.
The hot forming technology is an effective way for high reinforcement of stamping parts, and has wide application prospect in the field of automobiles. The hot forming process is adopted to manufacture the commercial vehicle wheel, and belongs to technical innovation in the wheel industry. The traditional material of the wheel industry is low alloy steel or dual-phase steel, and the strength of the wheel made of the hot forming steel can be greatly increased from 600MPa to 1300 MPa. In addition, the wheels are used as bearing parts, and the effect of high strengthening on light weight and light weight of the automobile is more remarkable.
Through preliminary search, the patent application No. 201710030911.2 discloses a method for preparing hot forming steel with tensile strength more than or equal to 2000 MPa. The invention adopts smelting, hot rolling, cold rolling and cover annealing to obtain the hot forming steel with the thickness of 1.2 mm. Patent No. 201710822552.4 discloses a method for producing thin hot-formed steel based on the CSP process, the steel sheet having a thickness of 1.0 to 3.0 mm. These patents produce thin gauge thermoformed steel for safety and structural parts of automobiles, which cannot be used in the manufacture of wheels. The patent number 201810208962.4 discloses a hot-formed steel with a tensile strength of 950MPa and a hot rolling process thereof, the invention adopts the hot rolling process to produce thick hot-formed steel, but the tensile strength of the hot-formed steel is lower, only about 1000MPa, and the requirement of high strength and light weight of commercial vehicle wheels cannot be met.
Disclosure of Invention
The invention aims to provide 1300 MPa-grade hot forming steel with good forming performance and welding performance for a rim and a preparation method thereof aiming at the defects of the technology.
In order to achieve the purpose, the 1300 MPa-grade hot forming steel for the wheel rim comprises the following chemical components in percentage by weight: 0.19 to 0.24 percent of C, 0.10 to 0.30 percent of Si, 1.00 to 1.40 percent of Mn, less than or equal to 0.010 percent of P, less than or equal to 0.004 percent of S, 0.020 to 0.040 percent of Ti, 0.0030 to 0.0040 percent of B, the balance of Fe and inevitable impurities, and the thickness of the steel is 3.0 to 6.0 mm.
Proper Ti is added on the basis of the traditional 22MnB5 series hot forming steel; considering that the steel plate needs to be rolled and welded firstly when the wheel rim is produced, and then hot stamping is carried out, the welding performance can be optimized by adding Ti.
The main components and the process of the invention have the following reasons for the action and control:
carbon: carbon is an inexpensive solid-solution strengthening element and is one of the main factors affecting yield strength and tensile strength. Meanwhile, carbon also has an important influence on the welding performance of the material. Generally, the higher the carbon content in the steel, the higher the yield strength and tensile strength, and the lower the weldability. In order to ensure that the hot forming steel with the tensile strength of 1300MPa grade is obtained, the carbon content at least reaches more than 0.19 percent under the condition of adopting Mn, B and microalloy elements, otherwise, the tensile strength of the plate after hot forming treatment is difficult to meet the requirement. On the other hand, if the carbon content is too high and exceeds 0.24%, the welding property of the plate material will be affected, thereby reducing the use value of the material. And the final annealing treatment of the hot forming steel can greatly relieve the internal stress, reduce the strength of the steel plate and improve the plasticity of the steel plate, so that the range of C can be properly widened when the final 1300MPa level requirement is met. Therefore, the carbon content in the steel should be controlled to be 0.19-0.24%, preferably 0.21-0.22%, considering the influence of carbon element on the strength and welding performance.
Silicon: silicon is the most basic element in steel and has no particularly direct influence on the mechanical properties of the plate. The steel for the wheel rim has higher requirement on the surface of the steel plate, if the silicon content is too high, the surface quality of the steel plate is reduced, and the silicon content is lower than 0.30 percent; if the silicon content is controlled below 0.10%, the smelting cost is additionally increased. Therefore, the silicon content is controlled to be 0.10 to 0.30%, preferably 0.22 to 0.25%.
Manganese: manganese is the most effective element for improving strength and toughness, and is also one of important alloy elements adopted by the invention. Manganese stabilizes austenite and reduces the critical quenching speed of steel, thereby improving the hardenability of the material. In the invention, in order to improve the hardenability and further ensure the required strength of the material after hot forming treatment, the manganese content at least reaches more than 1.0 percent; meanwhile, if the manganese content exceeds 2.0%, the risk of slab cracking will be significantly increased. Therefore, the manganese content should be controlled to be 1.0-2.0%, preferably 1.2-1.4%.
Sulfur: sulfur is an impurity element in steel, and if the sulfur content is too high, the hot brittleness tendency of the steel is increased. The sulfur in steel often exists in the form of sulfide of manganese, which is very disadvantageous to impact toughness of steel and causes anisotropy of properties, and thus, it is desirable to control the sulfur content in steel as low as possible. Therefore, the sulfur content in steel is controlled to 0.004% or less.
Phosphorus: phosphorus is an impurity element in steel, and if the content of the phosphorus is too high, an Fe2P eutectic structure is precipitated when the steel billet is solidified, and the cold-brittleness phenomenon is caused. Therefore, the lower the content of phosphorus, the better, and the actual production is generally controlled to 0.010% or less.
Titanium: titanium is one of the important alloying elements employed in the present invention. The titanium can play the roles of refining grains and improving toughness. In addition, the addition of titanium element is beneficial to improving the welding performance. If the content of the titanium element is too high, the amount of coarse carbide and nitride inclusions is increased, thereby affecting the comprehensive mechanical properties. Therefore, the titanium content should be controlled to 0.02 to 0.04%, preferably 0.33 to 0.35%.
Boron: boron is one of the important alloying elements employed in the present invention. The addition of a very small amount of boron to the hot formed steel will accumulate at the austenite grain boundaries, delaying ferrite nucleation, thus very effectively preventing transfer and ferrite formation during forming; if the boron content exceeds 0.0040%, the material will have a significantly increased tendency to heat cracking and will be detrimental to toughness. The tensile strength of the hot forming steel of the present invention is 1300MPa, so that the boron content is controlled to 0.0030 to 0.0040%, preferably 0.0035 to 0.0036%.
In the present invention, noble alloying elements such as Cu, Cr, Nb, Ni, Mo, etc. are not added from the viewpoint of improving the formability of the material and the economy, except for the limitation of the above chemical composition range.
Further, the thickness of the steel is 3.0-3.5 mm.
Also provides a preparation method of the 1300 MPa-grade hot forming steel for the wheel rim, which comprises the following steps:
1) smelting and casting
Uniformly mixing the components in percentage by weight to form molten steel, smelting the molten steel in a converter, then carrying out vacuum refining, and finally casting the molten steel into a casting blank;
2) heating of
Heating the casting blank to 1250-1290 ℃, and preserving heat for 150-180 min;
3) rolling of
Carrying out sectional rolling on the heated casting blank, wherein the rough rolling finishing temperature is 1050-1100 ℃, and the finish rolling finishing temperature is 850-900 ℃;
4) cooling down
Cooling the rolled steel to 650-710 ℃ at a cooling rate of 100-200 ℃/s for coiling;
5) annealing
And performing cover annealing treatment on the hot rolled coil, wherein the annealing temperature is 710-750 ℃, and the annealing time is 3.5-4 h.
And (3) immediately carrying out ultra-fast cooling on the rolled steel plate, wherein the cooling rate is more than or equal to 100 ℃/s, and the purpose is to inhibit the growth of crystal grains in the steel after rolling through high cooling speed, so that the crystal grains are kept in a fine and uniform crystal grain state before coiling, the final steel has fine crystal grain size, and the crystal grain size reaches 11 grades. Cooling to 650-710 ℃ and coiling to make the structure of the coiled steel plate be ferrite and pearlite structure. Because the subsequent cover type annealing treatment is carried out, the coiling temperature range of the hot rolled steel plate is wider, and the steel plate can obtain good mechanical property through the annealing process.
And performing cover annealing treatment on the coiled steel coil, wherein the annealing temperature is 710-750 ℃, and the annealing time is 3.5-4 h. Annealing at the temperature can eliminate the internal stress of the hot rolled steel plate, reduce the strength of the steel plate, improve the plasticity of the steel plate, improve the uniformity of the performance of the steel plate, ensure that the wheel rim does not crack in the welding and forming processes, and have no influence on the tensile strength of the wheel rim after hot forming. The final structure of the steel plate is ferrite plus pearlite, and the grain size reaches 11 grades.
According to the invention, the hot rolling and cover annealing treatment process is adopted, so that the strength of the steel plate can be reduced, the elongation is improved, the steel has good forming performance and welding performance, the tensile strength of the hot rolled steel plate is less than or equal to 520MPa, the yield strength is less than or equal to 400MPa, and the elongation is less than or equal to 30%, namely, the cover annealing can reduce the strength of the hot rolled plate and improve the elongation.
Further, in the step 1), the vacuum refining time is 15-20 min, and a desulfurizing agent is added for desulfurization during vacuum refining so as to ensure the desulfurization requirement.
Further, in the step 3), descaling is performed during rolling, the descaling is performed for at least five times in rough rolling, the number of the descaling headers is not less than two before finish rolling, and the descaling device is started after the first rack is finish rolled.
The steel plate prepared by the invention refers to a conventional hot forming treatment process, and the specific parameters are as follows: heating the steel plate to 960 ℃ at the speed of 50 ℃/s, keeping the temperature for 300s, then immediately feeding the heated steel plate into a die for stamping, and rapidly cooling the steel plate in the die to room temperature, wherein the cooling speed is more than 50 ℃/s. The hot-formed steel forms a martensite structure after cooling, the strength of the final martensite exceeds 1300MPa due to the solid solution strengthening effect of elements such as C, Mn in the steel, and the hardenability of the hot-formed steel sheet is increased due to the addition of a certain amount of B element, so that the martensite structure can be formed in the whole part. The tensile strength of the hot-formed steel plate is more than or equal to 1300MPa, the yield strength is more than or equal to 1000MPa, and the elongation is more than or equal to 10 percent, so that the steel for the wheel rim has good forming performance and welding performance, has good surface quality, and meets the requirements of the steel for the wheel.
Compared with the prior art, the invention has the following beneficial effects: adopting reasonable chemical components and an annealing process to obtain a hot-formed steel plate with a fine ferrite and pearlite structure and good comprehensive mechanical properties, wherein the tensile strength of the plate is less than or equal to 520MPa, the yield strength of the plate is less than or equal to 400MPa, and the elongation of the plate is more than or equal to 30%; after the hot forming steel is treated by the conventional hot forming process, the microstructure is martensite, the tensile strength is more than or equal to 1300MPa, the yield strength is more than or equal to 1000MPa, and the elongation is more than or equal to 10 percent, so that the high-strength lightweight requirement of the steel for the wheel rim of the automobile can be met, the steel for the wheel rim has good forming performance and welding performance, has good surface quality, and meets the requirement of the steel for the wheel.
Drawings
FIG. 1 is a metallographic structure view (ferrite + pearlite) of a hot formed steel sheet material of example 1 of the present invention before a hot forming treatment;
fig. 2 is a metallographic structure diagram (martensite) of a hot-formed steel sheet material after a hot-forming treatment in example 1 of the present invention.
Detailed Description
The invention is described in further detail below with reference to the figures and the specific embodiments.
Table 1 is a list of chemical compositions for each example of the present invention and comparative example;
table 2 is a table of the main process parameters of each example of the present invention and comparative example;
table 3 is a table of the performance tests of each example of the present invention and comparative example.
The examples and comparative examples of the invention were produced according to the following procedure:
1) smelting and casting
Uniformly mixing the components in percentage by weight to form molten steel, smelting the molten steel in a converter, then carrying out vacuum refining for 15-20 min, adding a desulfurizing agent during vacuum refining for desulfurization, and finally casting into a casting blank;
2) heating of
Heating the casting blank to 1250-1290 ℃, and preserving heat for 150-180 min;
3) rolling of
The heated casting blank is rolled in sections, the rough rolling finishing temperature is 1050-1100 ℃, the finish rolling finishing temperature is 850-900 ℃, descaling is carried out during rolling, the rough rolling descaling is not less than five times, the number of descaling headers before finish rolling is not less than two, and a descaling device is started after a first frame is finish rolled;
4) cooling down
Cooling the rolled steel to 650-710 ℃ at a cooling rate of 100-200 ℃/s for coiling;
5) annealing
Performing cover annealing treatment on the hot rolled coil, wherein the annealing temperature is 710-750 ℃, and the annealing time is 3.5-4 h;
6) and finishing and post-processing.
TABLE 1 chemical composition List for inventive and comparative examples
TABLE 2 List of the main process parameters for the examples of the invention and the comparative examples
TABLE 3 test results of mechanical Properties of examples and comparative examples of the present invention
As is apparent from Table 3, by adopting the chemical components and the annealing process of the invention, the hot-formed steel plate with fine ferrite and pearlite structure and good comprehensive mechanical property can be obtained, the tensile strength of the plate is less than or equal to 520MPa, the yield strength is less than or equal to 400MPa, and the elongation is more than or equal to 30 percent; after the hot forming steel is treated by the conventional hot forming process, the microstructure is martensite, the tensile strength is more than or equal to 1300MPa, the yield strength is more than or equal to 1000MPa, and the elongation is more than or equal to 10 percent, so that the high-strength lightweight requirement of the steel for the wheel rim of the automobile can be met, the steel for the wheel rim has good forming performance and welding performance, has good surface quality, and meets the requirement of the steel for the wheel.
Claims (6)
1. A1300 MPa-grade hot forming steel for a rim is characterized in that: the chemical components comprise the following components in percentage by weight: 0.19-0.24% of C, 0.10-0.30% of Si, 1.00-1.40% of Mn, less than or equal to 0.010% of P, less than or equal to 0.004% of S, 0.033-0.035% of Ti, 0.0030-0.0040% of B and the balance of Fe and inevitable impurities, wherein the thickness of the steel is 3.3-6.0 mm;
the preparation method comprises the following steps:
1) smelting and casting
Uniformly mixing the components in percentage by weight to form molten steel, smelting the molten steel in a converter, then carrying out vacuum refining, and finally casting the molten steel into a casting blank;
2) heating of
Heating the casting blank to 1250-1290 ℃, and preserving heat for 150-180 min;
3) rolling of
The heated casting blank is rolled in sections, the rough rolling finishing temperature is 1050-1100 ℃, the finish rolling finishing temperature is 850-900 ℃, descaling is carried out during rolling, the rough rolling descaling is not less than five times, the number of descaling headers before finish rolling is not less than two, and a descaling device is started after a first frame is finish rolled;
4) cooling down
Cooling the rolled steel to 650-710 ℃ at a cooling rate of 100-200 ℃/s for coiling;
5) annealing
And performing cover annealing treatment on the hot rolled coil, wherein the annealing temperature is 710-750 ℃, and the annealing time is 3.5-4 h.
2. The 1300MPa grade hot formed steel for wheel rims according to claim 1, wherein: the weight percentage of C is 0.21-0.22%.
3. The 1300MPa grade hot formed steel for wheel rims according to claim 1, wherein: the weight percentage of the Si is 0.22-0.25%.
4. The 1300MPa grade hot formed steel for wheel rims according to claim 1, wherein: the weight percentage of Mn is 1.2-1.4%.
5. The 1300MPa grade hot formed steel for wheel rims according to claim 1, wherein: the weight percentage of B is 0.0035-0.0036%.
6. The 1300MPa grade hot formed steel for wheel rims according to claim 1, wherein: in the step 1), the vacuum refining time is 15-20 min, and a desulfurizing agent is added for desulfurization during vacuum refining.
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